78206066 has 4 divisors (see below), whose sum is σ = 117309102. Its totient is φ = 39103032.

The previous prime is 78206059. The next prime is 78206099. The reversal of 78206066 is 66060287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48011041 + 30195025 = 6929^2 + 5495^2 .

It is a super-2 number, since 2×78206066² = 12232377518392712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19551515 + ... + 19551518.

Almost surely, 2^78206066 is an apocalyptic number.

78206066 is a deficient number, since it is larger than the sum of its proper divisors (39103036).

78206066 is a wasteful number, since it uses less digits than its factorization.

78206066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39103035.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 78206066 is about 8843.4193613104. The cubic root of 78206066 is about 427.6417978599.

The spelling of 78206066 in words is "seventy-eight million, two hundred six thousand, sixty-six".